AzureStaticWebApp environment name errors

The AzureStaticWebApp task has been failing since the version changed from 0.187.2 to 0.194.2. We're using it in a few pipelines, one of which errors with `The environment name provided has invalid character(s). Valid characters are 0-9, a-z, and A-Z` whereas the others error with `The environment name provided exceeds the character limit of 16.`

Reading #660 suggests this is the environment name specified in the deployment job in the pipeline, in which case our environment names do break these rules (e.g. InformationLeaflets_dev) but they are valid as far as ADO is concerned. Any advice would be appreciated.

Extract from one of the pipelines:
```
- stage: Deploy_${{ variables.env }}
pool: ${{ variables.agentPool }}
jobs:
- deployment: deploy
displayName: Deploy_${{ variables.env }}
environment: InformationLeaflets_${{ variables.env }}
strategy:
runOnce:
deploy:
steps:
// ...
- task: AzureStaticWebApp@0
displayName: Build and deploy app
inputs:
app_location: 'output'
skip_app_build: true
azure_static_web_apps_api_token: $(deployment_token)
```

Task output:
```
Starting: Build and deploy app
==============================================================================
Task : Deploy Azure Static Web App
Description : [PREVIEW] Build and deploy an Azure Static Web App
Version : 0.194.2
Author : Microsoft Corporation
Help : https://aka.ms/swadocs
==============================================================================
##[warning]Environment variable BUILD_SOURCEVERSIONMESSAGE is a multiline string and cannot be added to the build environment.
/usr/bin/bash /ado-agent/2.181.2/_work/_tasks/AzureStaticWebApp_18aad896-e191-4720-88d6-8ced4806941a/0.194.2/launch-docker.sh
DeploymentId: 80cfb68e-3d00-4152-b1bf-9b35891a66e3

App Directory Location: 'output' was found.
No Api directory specified. Azure Functions will not be created.
The environment name provided exceeds the character limit of 16.
```